CN106680110A - Cement-based composite material reinforced concrete interface shearing test device and test method - Google Patents
Cement-based composite material reinforced concrete interface shearing test device and test method Download PDFInfo
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- CN106680110A CN106680110A CN201611032309.4A CN201611032309A CN106680110A CN 106680110 A CN106680110 A CN 106680110A CN 201611032309 A CN201611032309 A CN 201611032309A CN 106680110 A CN106680110 A CN 106680110A
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- sliding sash
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a cement-based composite material reinforced concrete interface shearing test device. The device comprises reinforced old concrete, a cement-based composite material reinforcing layer sample, a base, a fixing mechanism, a loading mechanism and a supporting threaded rod, wherein the fixing mechanism comprises a movable front baffle plate and a fixed back baffle plate which are connected through a connecting threaded rod, and the old concrete is partially fixed on the base; the loading mechanism comprises a lifting type sliding rail, an orbit type sliding frame, a tension steel cable and a fixed pulley; the bottom of the orbit type sliding frame is level to the combining surface of the cement-based composite material reinforcing layer; the lifting type sliding rail is fixed on the supporting threaded rod in a free lifting way; the orbit type sliding frame can be fixed on the lifting type sliding rail in a sliding manner; the fixed pulley is fixed on one end of the lifting type sliding rail and is integrated with the orbit type sliding frame through the tension steel cable. The device disclosed by the invention is simple and easy to operate, convenient to assemble and test; the testing method based on the device can effectively determine the interface adhesive property of the cement-based composite material reinforced concrete structure.
Description
Technical field
The invention belongs to testing equipment technical field for building, and in particular to a kind of cement-base composite material reinforced concrete
Interface shearing experimental rig and method.
Background technology
, by easily damaged, deterioration after environment and load long term, carrying out reinforcement and repair to it can be effective for existing structures
Ensure the security of original structure and use function.Using high performance cement-based composites (as fleece, bar-mat reinforcement strengthen cement
Based composites) xoncrete structure is carried out reinforcing be current reinforcing engineering field extensive concern a kind of novel reinforced method,
Back-up coat is usually laminate structure in the method, and this is conducive to maintaining original structure sectional dimension and not increasing deadweight.
FRP is pasted with traditional employing adhesive to compare with steel plate reinforcement method, cement-base composite material and original structure base
There is more preferable compatibility between material, compensate for the defect that common strengthening with external bonding method should not be used in the complex environments such as humidity, high temperature.It is mixed
In solidifying soil reinforcing engineering, there must be enough adhesion strengths just to can guarantee that the two at reinforcing layer material and former concrete joint surface
Cooperative bearing deforms, and otherwise new and old material it is possible that unsticking, sliding and deformation etc., and then is led in loading process
Cause to reinforce failure.The adhesion strength of new and old storeroom is generally measured using interface shearing strength test, and traditional interface resists
It is that the positive and negative overlapping of the "L" shaped test specimen for being made up of two new-old concrete respectively is poured and builds up " Z " font test specimen to cut strength test,
Applying pressure in test specimen upper and lower surface again makes new-old concrete that the changing of the relative positions is produced at faying face, shear stress is formed, and is tied according to test specimen
Limiting pressure F when conjunction face area A and destruction determines interface shearing strength (τ=F/A).Interface is determined although with said method
Shearing strength is fairly simple, but the method focuses on the bonding situation for emphasizing two kinds of different materials faying faces, does not directly consider actual
In the true stressing conditions of back-up coat, different bond damage forms and back-up coat reinforcing material (fleece or bar-mat reinforcement) and
Impact of the factors such as thickness to interfacial bond property, and this is for high performance cement-based composites reinforced concrete structure technology
Effectively using particularly important.Although have at present part researcher by configure on pressure testing machine easy " spill " or
" convex " base, allows vertical pressure to act on the concrete strengthening test specimen of lower both sides binding cement based composites in concave or convex
Base is inside and outside to form the changing of the relative positions, completes the dual shear test between back-up coat and old concrete, but the result of the test is reinforced examination
Dimension control, the construction quality of both sides back-up coat, the disposition of both sides faying face and loading bias when part is poured etc.
Impact it is very big, easily because showing for unilateral back-up coat unsticking first or destruction occurs in back-up coats discontinuity in both sides in test
As so as to cannot Accurate Determining back-up coat and the interface shearing strength both old concrete.
Therefore, for the Test about Bond Strength between cement base web braces layer and former concrete interface, need using special
The shearing test device of door carries out interface shearing strength test, but at present such experimental rig not yet appears in the newspapers.
The content of the invention
For above-mentioned deficiency of the prior art, the invention provides a kind of simple structure, easy to operate, test accuracy
It is higher suitable for cement base web braces layer and the shearing test device and method of the test of old concrete interfacial bond property.
A kind of cement-base composite material reinforced concrete interface shearing experimental rig is provided one of for achieving the above object, this
Invention employs technical scheme below：
A kind of cement-base composite material reinforced concrete interface shearing experimental rig, including the old concrete and cement of reinforcing
Based composites back-up coat sample, base, fixed mechanism, load maintainer, the corner location of base is fixed on supporting loading machine
The studdle of structure；
The fixed mechanism includes removable front apron and positioning backboard, and the two is connected by connecting screw rod and will be old mixed
Solidifying soil part is fixed on base；
The load maintainer includes lift slide rail, rail mounted sliding sash, tension cable wire and fixed pulley；The rail mounted sliding sash
Bottom surface flushes with cement-base composite material back-up coat faying face, and what the lift slide rail can be freely lifted is fixed on studdle
On, the rail mounted sliding sash is slidably fixed on lift slide rail, and the fixed pulley is fixed on lift slide rail one end simultaneously
It is connected with rail mounted sliding sash by tension cable wire, vertical load is converted into into level so as to pass through tension cable wire and fixed pulley
Pulling force is put on rail mounted sliding sash, cement-base composite material back-up coat is occurred along the two adhesive surface i.e. interface with old concrete
Crisscross motion.
Preferably, the base is set to rectangle steel plate；It is described positioning backboard be fixedly welded on base plate, it is described can
The station that mobile front apron constitutes front apron and can move forward and backward in base with base coordinates.
Further, the base is provided with the embedded chute of multiple rows of equally distributed inverted " t " type, the removable front
Plate bottom is provided with multiple I-shaped plates, and I-shaped plate is identical with the quantity of the embedded chute of inverted " t " type, so as to institute
State removable front apron and base to realize between front apron and backboard by I-shaped plate and the embedded chute of inverted " t " type
The adjustment of distance.
Preferably, the removable front apron on the base is connected by connecting screw rod with positioning backboard in sample both sides
Connect, and the old concrete part for reinforcing test specimen is clamped, is fixed by adjusting connecting screw rod.
Preferably, the rail mounted sliding sash is connected by the draw-in groove of both sides with lift slide rail；The draw-in groove is embedded with
The lower free rolling steel ball of horizontal pull effect, make rail mounted sliding sash sliding sash along lift slide rail slidably.
Preferably, the lifting slide track surface is provided with rule.
The second object of the present invention is to provide a kind of above-mentioned cement-base composite material reinforced concrete interface shearing test dress
The test method put, comprises the steps：
S1, first, the concrete sample reinforced using cement-base composite material is positioned on base, will reinforce side upward
And allow test specimen one end to be close to position backboard, according to the removable front apron of sample dimensions adjustment and the distance for positioning backboard, then
Forward and backward baffle plate is connected and fixed by connecting screw rod, with the abundant fixed old concrete part for reinforcing test specimen；
S2 and then, by studdle adjust load maintainer height, it is ensured that the lower limb and cement base of rail mounted sliding sash
Web braces layer is that the interface of cement-base composite material back-up coat flushes, and makes cement base web braces layer with old concrete in level
Effective shear stress on interface can be formed under pulling force effect along the faying face occurred level changing of the relative positions of the two；Again by applying to tension cable wire
Plus vertical load, and vertical load is converted into by horizontal pull by fixed pulley puts on rail mounted sliding sash, sliding sash drives water
Mud base web braces layer slidably, until reinforcing damage layer or the unsticking between old concrete, stops adding on lift slide rail
Carry；
S3, the load applied by additional force snesor and displacement meter synchro measure and the corresponding sliding of test specimen loading end
Amount, or the corresponding displacement that is further applied load is recorded in good time using slide rail high scale chi, finally draw shear stress on interface-sliding complete
Curve.
The beneficial effects of the present invention is：
1), existing interface shearing experimental rig is applied to concrete strengthening layer using thicker block materials mostly, focuses on
Bonding situation at test bi-material faying face, does not consider reinforcing layer material thickness, self-characteristic etc. to interfacial bond property
Impact, thus the true stressing conditions between actual back-up coat and old concrete interface can not be accurately reflected, especially work as coagulation
When native back-up coat adopts fiber reinforcement high performance cement-based composites.The interface shearing experimental rig of the present invention can Validity Test
Interfacial bond property between high-performance cement-based thin plate and former xoncrete structure, can be directed to cement base web braces layer with it is old
Bonding situation between concrete interface is tested, and can comprehensively reflect sectional dimension, the ratio of reinforcement (or distribution rate) of composite
And the impact of the factor to interfacial bond property such as intensity, while the experimental rig is also applied for concrete strengthening layer using block material
The new and old material interface Test about Bond Strength of material.
2), the measure currently for the interfacial bond property between cement base web braces layer and old concrete mainly adopts and is
Dual shear test method, the method is by pasting composite thin plate back-up coat in old concrete test specimen both sides, then being equipped with
Special concave or convex loading bearing applies the interface shearing test that vertical pressure is completed between back-up coat and old concrete；But it is double
The constructing of dimension control, both sides back-up coat when face shearing test result is poured by old concrete, the place of both sides faying face
The impact of reason situation and loading bias etc. is very big, easily because unilateral back-up coat elder generation occurs in both sides back-up coat discontinuity in test
Unsticking or the phenomenon of destruction, so as to cannot effectively determine the actual interface shearing strength between both back-up coat and old concrete.This
The interface shearing experimental rig of invention uses single shear testing method, and charger can be high along studdle adjustment
Degree, eliminates the impact of the uncertainty to result of the test of dual shear test process, can effectively determine cement-base composite material
Interfacial bond property between thin layer and old concrete.
3), experimental rig of the invention simply, connects reliable, reasonable between each device, installs, tests easy；Wherein fix
Mechanism can be fixed in the range of base to various sizes of reinforcing test specimen；Load maintainer can be in studdle altitude range
It is freely lifted, that is, testing is not affected by reinforcing test specimen and pour and construct etc. caused scale error, be can ensure that in horizontal force action
Effective shear stress on interface can be formed at lower cement base web braces layer and old concrete faying face；Additionally, loading sliding sash and track
Between be provided with free rolling steel ball, the frictional force between the two can be effectively reduced so that measured result accurately, it is reliable, ensure this
The reliability of bright application.
4), in sum, apparatus of the present invention are simple, easy to operate, and are easy to Integration Assembly And Checkout, the test side based on the device
Method can effectively determine the interfacial bond property of cement-base composite material reinforced concrete structure, be concrete binding in reinforcing engineering
Face is processed and the reinforcement application of advanced composite material (ACM) provides more structurally sound technical support.
Description of the drawings
Fig. 1 is the schematic diagram of cement-base composite material reinforced concrete interface shearing experimental rig of the present invention.
Fig. 2 is the front view of Fig. 1.
Fig. 3 is the top view of Fig. 1.
Fig. 4 is the left view of Fig. 1.
Fig. 5 is the right view of Fig. 1.
Fig. 6 is the schematic diagram that front apron is may move in the present invention.
Fig. 7 is the internal structure schematic diagram of rail mounted sliding sash of the present invention.
Fig. 8 is the part-structure schematic diagram of lift slide rail (chi with a scale).
The implication of label symbol is as follows in figure：
1. base；2. backboard is positioned；3. front apron may move；4. connecting screw rod；5. old concrete；6. cement base is combined
Material reinforced layer；7. studdle；8. lift slide rail；9. rail mounted sliding sash；10. tension cable wire；11. fixed pulleys；12. steel
Pearl；13. draw-in grooves；14. rules
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the present invention is clearly and completely retouched
State.Following examples are only used for clearly illustrating technical scheme, and the guarantor of the present invention can not be limited with this
Shield scope.
It should be noted that to make simplified form, part related to the present invention is only schematically show in each figure,
They do not represent it as the practical structures of product.Herein removable front apron, positioning backboard "front", "rear" not
Baffle plate orientation is defined, it is also possible to be expressed as removable backboard, positioning front apron accordingly；" front " i.e. herein,
" afterwards " only for distinguishing two different baffle plates, the restriction to baffle plate is not constituted.
A kind of cement-base composite material reinforced concrete interface shearing experimental rig
As shown in Fig. 1 to 5, including old concrete 5 and the sample of cement-base composite material back-up coat 6, base 1, solid reinforced
Determine mechanism, load maintainer, be anchored in the studdle 7 of the corner location with supporting loading mechanism of base 1；
The fixed mechanism includes removable front apron 3 and positioning backboard 2, and the two is connected by connecting screw rod 4 and will
The part of old concrete 5 is fixed on base 1；
The load maintainer includes lift slide rail 8, rail mounted sliding sash 9, tension cable wire 10 and fixed pulley 11；The track
The bottom surface of formula sliding sash 9 flushes with the faying face of cement-base composite material back-up coat 6, the fixation that the lift slide rail 8 can be freely lifted
On studdle 7, the rail mounted sliding sash 9 is slidably fixed on lift slide rail 8, and the fixed pulley 11 is fixed on liter
The one end of drop formula slide rail 8 is simultaneously connected by tension cable wire 10 with rail mounted sliding sash 9, so as to pass through tension cable wire 10 and fixed pulley
Vertical load is converted into horizontal pull by 11 to be put on rail mounted sliding sash 9, makes cement-base composite material back-up coat 6 with old coagulation
Soil 5 is that interface occurs crisscross motion along the two adhesive surface.
Wherein, the base 1 is set to rectangle steel plate；The positioning backboard 2 is fixedly welded on base plate 1, described
The station that removable front apron 3 constitutes front apron and can move forward and backward in base 1 with base 1 coordinates.
With reference to shown in Fig. 6, the base 1 is provided with the embedded chute of multiple rows of equally distributed inverted " t " type, described removable
The bottom of front apron 3 is provided with multiple I-shaped plates, and quantity phase of the I-shaped plate with the embedded chute 10 of inverted " t " type
Together, so as to the removable front apron 3 and base by I-shaped plate and the embedded chute of inverted " t " type realize front apron and
The adjustment of distance between backboard.
Removable front apron 3 on the base 1 is connected by connecting screw rod 4 with positioning backboard 2 in sample both sides, and
It is clamped, fixes by adjusts the part of old concrete 5 of 4 pairs of reinforcing test specimens of connecting screw rod.
With reference to shown in Fig. 7, the rail mounted sliding sash 9 is connected by the draw-in groove 13 of both sides with lift slide rail 8；The draw-in groove
13 are embedded with the free rolling steel ball 12 under horizontal pull effect, make the sliding sash of rail mounted sliding sash 9 along the free skating of lift slide rail 8
It is dynamic.
As shown in figure 8, the surface of lift slide rail 8 is provided with rule 14.
A kind of test method of cement-base composite material reinforced concrete interface shearing experimental rig
Comprise the steps：
In practical application, the base 1 of device can be fixed on testing stand and be operated.
First, the concrete sample reinforced using cement-base composite material one side is positioned on base 1, side court will be reinforced
Go up and allow test specimen one end to be close to position backboard 2, according to the removable front apron 3 of sample dimensions adjustment and positioning backboard 2 away from
From, then connected forward and backward baffle plate and fixed by connecting screw rod 4, with the abundant fixed old concrete 5 for reinforcing test specimen
Point；
Then, the height of whole load maintainer is adjusted by the nut on studdle 7, it is ensured that the two of lift slide rail 8
Siding track is flushed in same level position, and the lower limb of rail mounted sliding sash 9 with the interface of cement base web braces layer, makes cement
Base web braces layer can form effective under horizontal pull effect with old concrete 5 along the faying face occurred level changing of the relative positions of the two
Shear stress on interface；Again vertical lotus is applied to tension cable wire 10 in loading end by vertical loading equipemtn such as motor or loading counterweight
Carry, and vertical load is converted into by horizontal pull by fixed pulley 11 and put on rail mounted sliding sash 9, sliding sash drives cement base thin
Plate back-up coat slidably, until reinforcing damage layer or the unsticking between old concrete, stops loading on lift slide rail 8.
In above-mentioned process of the test, the load and the corresponding slippage of test specimen loading end of applying can additional force snesor and displacements
Meter synchro measure, is possible with slide rail high scale chi 14 and records the corresponding displacement that is further applied load in good time, finally draws interface
Shear stress-sliding full curve, and result is analyzed.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of without departing from the technology of the present invention principle, some improvement and deformation can also be made, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of old concrete (5) and water of cement-base composite material reinforced concrete interface shearing experimental rig, including reinforcing
Cement-based composite material back-up coat (6) sample, it is characterised in that：Also include base (1), fixed mechanism, load maintainer, be fixed on bottom
The corner location of seat (1) is with the studdle (7) of supporting loading mechanism；
The fixed mechanism includes removable front apron (3) and positioning backboard (2), and the two is connected simultaneously by connecting screw rod (4)
Old concrete (5) is partly fixed on base (1)；
The load maintainer includes lift slide rail (8), rail mounted sliding sash (9), tension cable wire (10) and fixed pulley (11)；It is described
Rail mounted sliding sash (9) bottom surface flushes with cement-base composite material back-up coat (6) faying face, and the lift slide rail (8) can be free
What is lifted is fixed on studdle (7), and the rail mounted sliding sash (9) is slidably fixed on lift slide rail (8), described
Fixed pulley (11) is fixed on lift slide rail (8) one end and is connected with rail mounted sliding sash (9) by tension cable wire (10), from
And pass through tension cable wire (10) and fixed pulley (11) vertical load is converted into into horizontal pull to put on rail mounted sliding sash (9),
Make cement-base composite material back-up coat (6) that crisscross motion occur along the two adhesive surface with old concrete (5).
2. a kind of cement-base composite material reinforced concrete interface shearing experimental rig according to claim 1, its feature
It is：The base (1) is set to rectangle steel plate；It is described positioning backboard (2) be fixedly welded on base plate (1), it is described can
The station that mobile front apron (3) constitutes front apron and can move forward and backward in base (1) with base (1) coordinates.
3. a kind of cement-base composite material reinforced concrete interface shearing experimental rig according to claim 2, its feature
It is：The base (1) is provided with the embedded chute of multiple rows of equally distributed inverted " t " type, removable front apron (3) bottom
Multiple I-shaped plates are provided with, and I-shaped plate is identical with the quantity of the embedded chute of inverted " t " type, so as to described removable
Dynamic front apron (3) realizes the spacing of front apron and backboard with base by I-shaped plate and the embedded chute of inverted " t " type
From adjustment.
4. a kind of cement-base composite material reinforced concrete interface shearing experimental rig according to claim 1, its feature
It is：Removable front apron (3) on the base (1) is connected by connecting screw rod (4) with positioning backboard (2) in sample both sides
Connect, and the old concrete (5) for reinforcing test specimen is partly clamped, is fixed by adjusting connecting screw rod (4).
5. a kind of cement-base composite material reinforced concrete interface shearing experimental rig according to claim 1, its feature
It is：The rail mounted sliding sash (9) is connected by the draw-in groove (13) of both sides with lift slide rail (8)；The draw-in groove (13) embeds
There is the free rolling steel ball (12) under horizontal pull effect, make rail mounted sliding sash (9) sliding sash along lift slide rail (8) free skating
It is dynamic.
6. a kind of cement-base composite material reinforced concrete interface shearing experimental rig according to claim 1, its feature
It is：Lift slide rail (8) surface is provided with rule (14).
7. a kind of cement-base composite material reinforced concrete interface shearing experimental rig as described in any one of claim 1 to 6
Test method, it is characterised in that comprise the steps：
S1, first, the concrete sample reinforced using cement-base composite material (6) is positioned on base (1), will reinforce side court
Go up and allow test specimen one end to be close to position backboard (2), according to the removable front apron (3) of sample dimensions adjustment and positioning backboard
(2) distance, then connected forward and backward baffle plate and fixed by connecting screw rod (4), mixed with abundant fixed the old of test specimen of reinforcing
Solidifying soil (5) part；
S2 and then, by studdle (7) adjust load maintainer height, it is ensured that the lower limb and cement of rail mounted sliding sash (9)
The interface of base web braces layer flushes, and makes cement-base composite material (6) and the old concrete (5) can be along two under horizontal pull effect
The faying face occurred level changing of the relative positions of person, forms effective shear stress on interface；Again by applying vertical load to tension cable wire (10), and
Vertical load is converted into into horizontal pull by fixed pulley (11) to put on rail mounted sliding sash (9), sliding sash drives cement base thin
Plate back-up coat slidably, until reinforcing damage layer or the unsticking between old concrete, stops loading on lift slide rail (8)；
S3, the load applied by additional force snesor and displacement meter synchro measure and the corresponding slippage of test specimen loading end, or
The corresponding displacement that is further applied load is recorded in good time using slide rail high scale chi (14), finally draws shear stress on interface-sliding complete
Curve.
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| JPS60260810A (en) * | 1984-06-07 | 1985-12-24 | Shimizu Constr Co Ltd | Shearing displacement gauge |
| CN204694573U (en) * | 2015-06-26 | 2015-10-07 | 青岛理工大学 | A kind of uncovered concrete tubular pile stake Soil Interface shearing simulation test unit |
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